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annotate libinterp/corefcn/hex2num.cc @ 20853:1142cf6abc0d

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2015 Code Sprint: remove class of function from docstring for all C++ files.
author Rik <rik@octave.org>
date Sat, 12 Dec 2015 07:40:03 -0800
parents f428cbe7576f
children b17fda023ca6
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1 /*
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2
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3 Copyright (C) 2008-2015 David Bateman
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include <algorithm>
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28
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29 #include "defun.h"
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30 #include "error.h"
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31 #include "gripes.h"
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32 #include "oct-obj.h"
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33 #include "utils.h"
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34
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35 DEFUN (hex2num, args, ,
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36 "-*- texinfo -*-\n\
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37 @deftypefn {} {@var{n} =} hex2num (@var{s})\n\
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38 @deftypefnx {} {@var{n} =} hex2num (@var{s}, @var{class})\n\
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39 Typecast the 16 character hexadecimal character string to an IEEE 754\n\
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40 double precision number.\n\
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41 \n\
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42 If fewer than 16 characters are given the strings are right padded with\n\
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43 @qcode{'0'} characters.\n\
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44 \n\
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45 Given a string matrix, @code{hex2num} treats each row as a separate number.\n\
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46 \n\
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47 @example\n\
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48 @group\n\
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49 hex2num ([\"4005bf0a8b145769\"; \"4024000000000000\"])\n\
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50 @result{} [2.7183; 10.000]\n\
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51 @end group\n\
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52 @end example\n\
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53 \n\
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54 The optional argument @var{class} can be passed as the string\n\
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55 @qcode{\"single\"} to specify that the given string should be interpreted as\n\
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56 a single precision number. In this case, @var{s} should be an 8 character\n\
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57 hexadecimal string. For example:\n\
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58 \n\
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59 @example\n\
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60 @group\n\
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61 hex2num ([\"402df854\"; \"41200000\"], \"single\")\n\
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62 @result{} [2.7183; 10.000]\n\
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63 @end group\n\
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64 @end example\n\
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65 @seealso{num2hex, hex2dec, dec2hex}\n\
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66 @end deftypefn")
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67 {
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68 octave_value retval;
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69
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70 int nargin = args.length ();
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71
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72 if (nargin < 1 || nargin > 2)
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73 print_usage ();
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74
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75 if (nargin == 2 && ! args(1).is_string ())
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76 error ("hex2num: CLASS must be a string");
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77 else
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78 {
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79 const charMatrix cmat = args(0).char_matrix_value ();
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80 std::string prec = (nargin == 2) ? args(1).string_value () : "double";
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81 bool is_single = (prec == "single");
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82 octave_idx_type nchars = (is_single) ? 8 : 16;
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83
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84 if (cmat.columns () > nchars)
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85 error ("hex2num: S must be no more than %d characters", nchars);
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86 else if (prec != "double" && prec != "single")
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87 error ("hex2num: CLASS must be either \"double\" or \"single\"");
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88 else
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89 {
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90 octave_idx_type nr = cmat.rows ();
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91 octave_idx_type nc = cmat.columns ();
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92
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93 if (is_single)
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94 {
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95 FloatColumnVector m (nr);
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96
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97 for (octave_idx_type i = 0; i < nr; i++)
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98 {
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99 union
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100 {
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101 uint32_t ival;
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102 float dval;
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103 } num;
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104
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105 num.ival = 0;
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106
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107 for (octave_idx_type j = 0; j < nc; j++)
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108 {
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109 unsigned char ch = cmat.elem (i, j);
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110
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111 if (isxdigit (ch))
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112 {
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113 num.ival <<= 4;
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114 if (ch >= 'a')
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115 num.ival += static_cast<uint32_t> (ch - 'a' + 10);
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116 else if (ch >= 'A')
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117 num.ival += static_cast<uint32_t> (ch - 'A' + 10);
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118 else
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119 num.ival += static_cast<uint32_t> (ch - '0');
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120 }
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121 else
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122 {
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123 error ("hex2num: illegal character found in string S");
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124 break;
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125 }
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126 }
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127
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128 if (nc < nchars)
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129 num.ival <<= (nchars - nc) * 4;
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130
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131 m(i) = num.dval;
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132 }
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133
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134 retval = m;
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135 }
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136 else
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137 {
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138 ColumnVector m (nr);
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139
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140 for (octave_idx_type i = 0; i < nr; i++)
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141 {
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142 union
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143 {
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144 uint64_t ival;
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145 double dval;
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146 } num;
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147
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148 num.ival = 0;
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149
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150 for (octave_idx_type j = 0; j < nc; j++)
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151 {
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152 unsigned char ch = cmat.elem (i, j);
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153
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154 if (isxdigit (ch))
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155 {
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156 num.ival <<= 4;
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157 if (ch >= 'a')
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158 num.ival += static_cast<uint64_t> (ch - 'a' + 10);
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159 else if (ch >= 'A')
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160 num.ival += static_cast<uint64_t> (ch - 'A' + 10);
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161 else
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162 num.ival += static_cast<uint64_t> (ch - '0');
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163 }
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164 else
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165 {
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166 error ("hex2num: illegal character found in string S");
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167 break;
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168 }
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169 }
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170
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171 if (nc < nchars)
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172 num.ival <<= (nchars - nc) * 4;
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173
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174 m(i) = num.dval;
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175 }
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176
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177 retval = m;
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178 }
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179 }
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180 }
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181
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182 return retval;
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183 }
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184
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185 /*
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186 %!assert (hex2num (["c00";"bff";"000";"3ff";"400"]), [-2:2]')
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187 %!assert (hex2num (["c00";"bf8";"000";"3f8";"400"], "single"), single([-2:2])')
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188 */
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189
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190 DEFUN (num2hex, args, ,
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191 "-*- texinfo -*-\n\
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192 @deftypefn {} {@var{s} =} num2hex (@var{n})\n\
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193 Typecast a double or single precision number or vector to a 8 or 16\n\
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194 character hexadecimal string of the IEEE 754 representation of the number.\n\
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195 \n\
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196 For example:\n\
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197 \n\
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198 @example\n\
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199 @group\n\
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200 num2hex ([-1, 1, e, Inf])\n\
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201 @result{} \"bff0000000000000\n\
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202 3ff0000000000000\n\
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203 4005bf0a8b145769\n\
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204 7ff0000000000000\"\n\
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205 @end group\n\
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206 @end example\n\
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207 \n\
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208 If the argument @var{n} is a single precision number or vector, the returned\n\
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diff changeset
209 string has a length of 8. For example:\n\
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210 \n\
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211 @example\n\
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212 @group\n\
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213 num2hex (single ([-1, 1, e, Inf]))\n\
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214 @result{} \"bf800000\n\
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215 3f800000\n\
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diff changeset
216 402df854\n\
81d3c4409645 num2hex: Handle single precision argument correctly (bug #39607)
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diff changeset
217 7f800000\"\n\
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diff changeset
218 @end group\n\
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219 @end example\n\
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220 @seealso{hex2num, hex2dec, dec2hex}\n\
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221 @end deftypefn")
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222 {
20812
d9ca869ca124 maint: Clean-up more instances of print_usage().
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diff changeset
223 octave_value retval;
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224
20819
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225 if (args.length () != 1)
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226 print_usage ();
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227
8bb38ba1bad6 eliminate return statements after calls to print_usage
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diff changeset
228 if (args(0).is_single_type ())
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diff changeset
229 {
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230 const FloatColumnVector v (args(0).float_vector_value ());
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231
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232 octave_idx_type nchars = 8;
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diff changeset
233 octave_idx_type nr = v.numel ();
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diff changeset
234 charMatrix m (nr, nchars);
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diff changeset
235 const float *pv = v.fortran_vec ();
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236
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diff changeset
237 for (octave_idx_type i = 0; i < nr; i++)
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238 {
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diff changeset
239 union
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diff changeset
240 {
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diff changeset
241 uint32_t ival;
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diff changeset
242 float dval;
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diff changeset
243 } num;
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244
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diff changeset
245 num.dval = *pv++;
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diff changeset
246
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247 for (octave_idx_type j = 0; j < nchars; j++)
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diff changeset
248 {
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diff changeset
249 unsigned char ch =
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diff changeset
250 static_cast<char>(num.ival >> ((nchars - 1 - j) * 4) & 0xF);
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diff changeset
251 if (ch >= 10)
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diff changeset
252 ch += 'a' - 10;
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diff changeset
253 else
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diff changeset
254 ch += '0';
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diff changeset
255
20678
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diff changeset
256 m.elem (i, j) = ch;
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diff changeset
257 }
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diff changeset
258 }
17177
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259
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260 retval = m;
17177
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diff changeset
261 }
7639
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diff changeset
262 else
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parents:
diff changeset
263 {
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parents:
diff changeset
264 const ColumnVector v (args(0).vector_value ());
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parents:
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265
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266 octave_idx_type nchars = 16;
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267 octave_idx_type nr = v.numel ();
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diff changeset
268 charMatrix m (nr, nchars);
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diff changeset
269 const double *pv = v.fortran_vec ();
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270
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271 for (octave_idx_type i = 0; i < nr; i++)
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272 {
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273 union
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274 {
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diff changeset
275 uint64_t ival;
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diff changeset
276 double dval;
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277 } num;
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278
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279 num.dval = *pv++;
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280
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281 for (octave_idx_type j = 0; j < nchars; j++)
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282 {
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283 unsigned char ch =
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284 static_cast<char>(num.ival >> ((nchars - 1 - j) * 4) & 0xF);
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285 if (ch >= 10)
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286 ch += 'a' - 10;
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287 else
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288 ch += '0';
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289
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290 m.elem (i, j) = ch;
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291 }
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292 }
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293
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294 retval = m;
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295 }
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296
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297 return retval;
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298 }
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299
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300 /*
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301 %!assert (num2hex (-2:2), ["c000000000000000";"bff0000000000000";"0000000000000000";"3ff0000000000000";"4000000000000000"])
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302 %!assert (num2hex (single (-2:2)), ["c0000000";"bf800000";"00000000";"3f800000";"40000000"])
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303 */